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- 검색키워드
- 저자 : Almessiere M.A. (검색결과 5 건)
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M. A. Almessiere,Y. Slimani,A.V. Trukhanov,A. Baykal,H. Gungunes,E.L. Trukhanova,S.V. Trukhanov,V.G. Kostishin 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.90 No.-
The dysprosium ions (Dy3+)-substituted nanosized ferrites (NFs) of composition [Ni0.5Co0.5](DyxFe2-x)O4(x0.08) were prepared using the citrate gel process. To analyse the magnetic properties of the samples,the Mössbauer spectroscopy methods and vibrating sample magnetometry (VSM) were applied. Theroom temperature Mössbauer spectra werefitted to determine the hyperfine parameters of the proposedNFs. The preferential occupation of the octahedral B sites by the Dy3+ in the spinel ferrite sublattice wasconfirmed from the cations distribution. The hyperfine magneticfield of both sublattice decreasedwhereas the increase in the Dy3+ substitution was observed. The S-parameters of the prepared NFs in thehigh frequency range were measured by the co-axial method. In addition, the MW reflection losses wereevaluated by means of the frequency-dependent (in the range of 1–20 GHz) complex permittivity andpermeability spectra. All the NFs indicated that the absorption of the electromagnetic radiation wasranging between 2.9–5.5 GHz due to the natural ferromagnetic resonance. A correlation amongst the Dy3+ concentration, microstructure, magnetic and microwave (MW) characteristics of these NFs wasestablished. It’s been asserted that by controlling the Dy3+ contents carefully, the MW absorption andmagnetic attributes of the proposed spinel NFs can be tailored.
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Seyda Tugba Gunday,M. A. Almessiere,Hamide Aydın,Ayhan Bozkurt 한국고분자학회 2019 Macromolecular Research Vol.27 No.7
The design of novel proton exchange membranes with high conductivity and better dimensional stability has become increasingly important due to the need for applications in different devices. The present work shows the acid-doped and crosslinked polyacrylamide (PAM) networks including flexible spaces. To this end PAM was modified with 1,4-butanediol diglycidyl ether (BG) to form PAM35BG and PAM50BG networks, which would afford more space for protonated solvents. The reaction of PAM with BG was monitored by FTIR and 13C CP-MAS NMR. The polymer electrolytes were produced by acid doping at several stoichiometric ratios with respect to the monomer repeat unit of a host polymer. The resulting materials exhibited better thermal, chemical, and electrochemical stabilities and had distinct T g values. Additionally, the pores of the PAM-BG materials were filled with H3PO4 to get PAM35BG0.5H3PO4 and PAM50BG1.0H3PO4. The doping enhanced the proton conductivities of the membranes as high as 0.003 S/cm at 120 oC under an anhydrous atmosphere. The proton diffusion mechanism and the dielectric relaxation were further examined using the complex modulus formalism, M*.
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M. Al Shafouri,Naser M. Ahmed,Z. Hassan,M. A. Almessiere 한국섬유공학회 2020 Fibers and polymers Vol.21 No.8
Curcuminoids, a polyphenol from turmeric (Curcuma longa L.) have well-known diverse medical benefits. However, the nature of emitted light from curcuminoids and their poor stability limit their illumination applications but canbe further improved using nanofibers and nanoparticles of curcuminoids. In this study, poly(methyl methacrylate) (PMMA)integrated curcuminoid nanofibers (PICNFs) were prepared through electrospinning and characterised. PMMA was mixedwith C. longa L. powder to obtain impurity-free curcuminoid solution. Solutions with altering volumes (1, 2, 3, 4 and 5 ml)were spun to grow desired PICNFs. The structural, morphological and optical properties of the as-synthesised PICNFs (withand without annealing) were evaluated as a function of various PMMA concentrations (5, 10 and 15 wt%) to determine thefeasibility of improving down-conversion white light emission. The chromatic traits of the proposed PICNFs were analysedunder different light-emitting diode LED pumping wavelengths (365, 390 and 445 nm). The chromaticity coordinates (CIE),correlated colour temperature (CCT) and colour rendering index (CRI) of the obtained PICNFs were measured. The FTIRspectra of as-grown PICNFs displayed various characteristic IR bands, which were assigned to the vibrations of differentfunctional groups in the structures. The FESEM images of pre- and post-annealed samples revealed the formation ofnanofibers (diameter ranging from 250 nm to 300 nm) and nanoparticles (diameter ranging from 9 nm to 18 nm). Theoptimum values of CIE, CRI and CCT for the studied PICNFs were (0.3092, 0.315), 76.3 and 6,856 K, respectively.
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Hannachi E.,Slimani Y.,Almessiere M.A.,Alotaibi S.A.,Omelchenko L.V.,Petrenko E.V.,Kurbanov U.,Ben Azzouz F.,Solovjov A.L.,Baykal A. 한국물리학회 2023 Current Applied Physics Vol.48 No.-
We report the effect of the addition of BaTiO3 and WO3 nanoparticles on the pseudogap and excess conductivity of YBCO polycrystal. The excess conductivity analysis showed that the experimental data of pure and sample added with low amount of WO3 and BaTiO3 were perfectly described by the 2D Maki-Thompson (MT) and 3D Aslamazov-Larkin (AL) models. A sharp decrease in excess conductivity was obtained for samples added with high amount of nanoparticles where the analysis indicated the presence of the AL contribution and Lawrence- Doniach (LD) models. The pseudogap (PG) results showed that the value of Tpair (the temperature at which local pairs are transformed from strongly bound bosons into the fluctuating Cooper pairs) increased from around 117 K for the pure sample to around 187 K for sample co-added with low amount of nanoparticles. The pseudogap Δ*(TG) reduced from 230.9 K (for pure sample) to 223.4 K (for added sample).
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Algarni R.,Slimani Y.,Hannachi E.,Almessiere M.A.,Alqahtani B.H.,Akhtar Sultan,Ben Azzouz F. 한국물리학회 2021 Current Applied Physics Vol.27 No.-
YBa2Cu3O7-δ (or YBCO) superconductors added with various concentrations of dysprosium oxide nanoparticles (NP-Dy2O3) were prepared using the solid-state process. The additive NP-Dy2O3 has a size of about 10 nm and presents a para/ferromagnetic transition at about 300 K. The characterization of samples was probed via XRD, TEM, SEM, DC magnetization, and AC susceptibility measurements. Some models were employed to compute superconducting parameters like intragranular critical current density under a magnetic field (Jcm(H)), the density of intragranular pinning force for Abrikosov vortex (εg(0)), intergranular critical current density (Jc,inter), intergranular electrical character, superconductor grain volume fraction (fs). The correlation between these parameters and microstructure was discussed. The inclusion of NP-Dy2O3 does not alter the structural properties and the spatial growth of YBa2Cu3O7-δ. NP-Dy2O3 addition led to significant enhancements of Jcm(H) and εg(0). The decrement in Jc,inter was attributed to the change of grain boundary characteristics that transformed from SNS to SINS junction due to NP-Dy2O3 addition.
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